Switches are commonly replaced parts in power tools. A switch handles all on/off and variable speed functions. They also play a role in electric braking by momentarily reversing electrical polarity. Because switches use mechanical internals, they tend to degrade and wear out over time, eventually requiring replacement. Some common signs of a broken or failing switch are: 1. Tool has completely stopped functioning — it will not turn on. 2. Tool operates intermittently, requiring multiple attempts to turn on, until eventually it no longer turns on at all. 3. Variable speed function and electric braking are not working properly. Trigger Switch Part Number: 153609-00 This switch is compatible with the DW708 Compound Miter Saw Types 1, 3, and 4 only. Product Name: Trigger Switch Part Number: 153609-00 Compatible Model: DW708 Compound Miter Saw Types 1, 3, and 4 only. Installation guide not included. Professional installation is recommended. Please verify compatibility carefully before purchase. The product may be updated periodically; slight variations in appearance or color between batches may occur, but these do not affect functionality. Color: As shown Material: Plastic Package Contents: 1 x Trigger Switch Note: Light reflection and display settings may cause slight color differences between the image and the actual item. Measurement tolerance: ±1–3 cm.